That again may not be true as anuragn has already pointed out above. The STBs (both Tatasky+ and big TV) MAY be capable of HD output. Please go through his post as I cannot find better word to describe the same.
Look, even if we get HD channels, it might not be 1080p. If its 720p or 576p or 1080i, then an upscaling STB would upscale the channel images to 1080p! Just like any upscaling dvd player does (The upscaling done in case of DivX videos via hdmi to 1080p is awesome. So imagine something like that on your STB!). So, upscaling options would definitely help! Even 576i is supposedly more high def than dvd, coz it has higher resolution than a standard dvd. So, am I watching high def on my Big TV STB? Definitely not! (My MX component cable upscales to 576i by default when connected with the stb)
At this point, without the upscaling, there's no option (in both Big Tv and Tata Sky Plus STB) to achieve a 1080p resolution. Only if a video signal is 1080p, only then will a component produce 1080p. Otherwise a componet cable (without the upscaling options) would display images as it gets it. 720p, 576p, or 1080i.
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